I am pretty sure I just saw a couple HP desktops offered at CDW that come pre-installed with Linux. Proably some Mandrake version.
I have recently begun using one of my machines with Linux Mandrake 8.1 as a general desktop, but find obviously that it isn't as easy to use or easily networked into a Win 2000 environment. A techie doesnt have many problems with navigation, but a general user?? Forget it.